JP2003244051A - Radio base station equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce the power consumption and size of a base station device of a plurality of sectors. SOLUTION: A modulation device 12 for sectors SA1 to SA3.
Each of the outputs of -1 to 12-3 is divided into two by a distributor 41, one of which is supplied to a sector-compatible input terminal of a multi-terminal power combining type power amplifier 33, and the output of a sector-compatible output terminal of the power amplifier 31 is output. The distortion detecting circuit 4 supplies the signals to the distributors / combiners 42 and detects the distortion generated in the main amplifiers 22-1 to 22-3 in each distributor 41 and each distributor / combiner 42.
0A, the output of the distortion detection circuit 40A corresponding to the sector is removed by the distortion removal circuit 40B, and the output is supplied to the antennas A1 to A3 of the sectors SA1 to SA3, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for a wireless base station which provides a service by dividing a service area (area) into a plurality of sectors (fans) in a mobile wireless system.

[0002]

2. Description of the Related Art In a wireless communication system, there is a sector system in which a service area of one base station is divided into a plurality of sectors in order to improve frequency utilization efficiency. In the sector method, since wireless communication services are provided independently in each sector, wireless devices are separately installed in one wireless base station for each sector. For example, PDC (Personal
In a three-sector compatible base station, which is generally used for digital cellular, the service area is divided into three sectors SA1, SA2, SA3 with 120-degree angular intervals, as shown in FIG. 3A.
Antenna S for each sector SA1, SA2, SA3
1, A2, A3 are provided, and as shown in FIG. 3B, the antennas A1, A2, A3 are antenna duplexers 11-1, 11
It is connected to -2 and 11-3. Sectors SA1, SA2
The modulated output signals from the modulators 12-1, 12-2, 12-3 for SA3 are transmission amplifiers 13-1, 13-2, 1
The power is amplified in 3-3, respectively, and the feeders 14-1, 1
Power is supplied to the antennas A1, A2 and A3 through the antennas 4-2 and 14-3 and the antenna duplexers 11-1, 11-2 and 11-3, respectively. Annate shared device 11
Antennas A1, separated by -1, 11-2, 11-3
The received signals of A2 and A3 are low noise amplifiers 15-1 and 15
Demodulators 16-1, 1 through -2 and 15-3, respectively
6-2 and 16-3 are supplied.

That is, the antenna As (s = 1, 2, 3), the antenna duplexer 11-s, the modulator 12-s, and the transmission amplifier 13 are provided for each of the sectors SA1, SA2, SA3.
-S, feeder 14-s, low noise amplifier 15-s, demodulator 16-s, radio equipment for sector 17-1, 17-
2, 17-3 are individually provided for each sector SA1, SA
2, each SA3 provided wireless communication service independently. By the way, there is a multi-port amplification device as an amplifier configuration that can reduce the power consumption of a plurality of transmission amplifiers. The structure of a typical multi-port amplifier is shown in FIG. The multi-port amplifier includes, for example, an input side hybrid circuit (multi-terminal power combiner) 21 and a plurality of main amplifiers 2.
2-1 to 22-N and an output side hybrid circuit (multi-terminal power combiner) 22. The input side hybrid circuit 21 and the output side hybrid circuit 23 are generally π.
It is composed of a Butler matrix circuit using a / 2 hybrid.

In the multi-port amplifier, an input signal is equally distributed to a plurality of main amplifiers 22-1 to 22-N by an input side multi-terminal power combiner (hybrid circuit) 21 and amplified. Is distributed to each system by the output side multi-terminal power combiner (hybrid circuit) 23, so that each amplifier 22- of the multi-port amplifier is independent of the load of each system.
The feature is that the input power to 1 to 22-N can be made uniform.
However, in the conventional amplifier configuration (individual configuration) as shown in FIG. 3, each amplifier is designed assuming the maximum load regardless of the load of the input system. Therefore, the saturation output of the entire multi-port amplifier configuration can be reduced to 1 / system number of the saturation output of the entire individual configuration.

The multiport amplifying device has a problem that electric power leaks to another system due to its configuration. Generally, power leakage is evaluated by isolation. When applying a multi-port amplifier to a multi-beam or adaptive array system, the isolation causes an error from the design value in the beam or null directions. Therefore, it is necessary to increase the isolation of the multiport amplifying device as much as possible. To improve this isolation, it is necessary to make the gain and phase characteristics of the hybrid and individual amplifiers uniform. These relations are related to the literature (Shunichiro Egami, Makoto Kawai, Multi-terminal power combining type multi-beam transmission system, IEICE Transactions B, Vol.J69-B, No.2, pp.206-212, Feb.1986. )
Is shown in. In order to achieve isolation of 8 dB or more between 8 ports, gain deviation of ± 1 dB and phase deviation of ± 10 deg are required. In order to achieve these deviations, it is necessary to equalize the electrical characteristics of the hybrid and individual amplifiers, and a great deal of effort is required to adjust the equalization. Up to now, the isolation of the multi-port amplifier installed on the satellite has been 20 dB (reference document, Yamamoto member city, Horikawa Koji, Tanaka Masayoshi, ETS-.
2.5GHz band 100W output multi-port amplifier with VI, 1990 IEICE Spring National Convention, B-2
04, Mar. 1990). Further, it is extremely difficult to achieve the isolation of the conventional multi-port amplifier configuration of 60 dB or more from the viewpoint of the adjustment accuracy.

From these points, the present inventors have proposed a feedforward multi-terminal power combining type power amplifier in International Publication WO01 / 22574A1 (published on March 29, 2001). This principle structure is shown in FIG. According to the present invention, the input side multi-terminal power combiner 2 shown in FIG.
1, between the input port IPn (n = 1, ..., N) and the output port OPn of each system, as compared with the conventional multi-terminal power combining type power amplifier consisting of the amplifier 22-1 and the output side multi-terminal power combiner 23. In, a feedforward amplifier circuit 24-n including the main amplifier 22-n is configured. In a multi-terminal power combining type power amplifier, power leakage occurs between ports due to variations in the electrical characteristics of the hybrid and the main amplifier. Therefore, interference occurs between the ports, and the beam directivity formed by the array antenna does not follow a predetermined design. In order to keep the beam directivity formed by the array antenna as designed, it is necessary to minimize the isolation between the ports. For that purpose, it is necessary to reduce variations in the characteristics of the π / 2 hybrid that constitutes the main amplifier and the input-side and output-side multi-terminal power combiners.
The characteristics of the π / 2 hybrid can be relatively easily configured with high accuracy. Therefore, by configuring the feedforward amplifier circuit 24-n for the main amplifier 22-n for each system, the variation in the electrical characteristics of the main amplifier 22-n can be reduced. As a result, power leakage to other ports can be reduced,
Therefore, isolation between ports can be increased.

FIG. 6 shows a specific example thereof. This example is shown in FIG.
Each of the feedforward amplifier circuits 24-n in the principle configuration shown in (4) is configured between the input side multi-terminal power combiner 21 and the output side multi-terminal power combiner 23 corresponding to each port. That is, N system input terminals IP1, ..., I
An input-side multi-terminal power combiner 21 having a PN and performing N-system input power combining and distribution, and an input-side multi-terminal power combiner 2
N independent feed-forward amplifier circuits 24-1, ..., 24-- each connected to N output terminals
N and N-system feedforward amplifier circuits 24-1,
, ..., N, which have input terminals respectively connected to output terminals, and output-side multi-terminal power combiner 23 connected to N-system output terminals OP1, ... An amplifier is constructed.

Each feedforward amplifier circuit 24-n receives an input signal from the main amplifier path 4AM and the linear signal transfer path 4A.
Power divider 41 for distributing to L, first variable phase shifter 4P1, first variable attenuator 4A1 and main amplifier 22-n inserted in series in main amplifier path 4AM, and main amplifier path 4AM
The output of and the output of the linear signal transmission path 4AL are distributed and combined,
A power distributor / combiner 42 for outputting to the main signal transmission path 4BM and the distortion injection path 4DL, a second variable phase shifter 4P2, a second variable attenuator 4A2 and an auxiliary amplifier 4X inserted in series in the distortion injection path 4DL, The output of the main signal transmission path 4BM and the output of the distortion injection path 4DL are power-combined, and the main amplifier 22-n
And a power combiner 43 that cancels the generated distortion. The loop from the power distributor 41 to the power distributor / combiner 42 of the feedforward amplifier circuit 24-n is referred to as a distortion detection circuit 40A, and the loop from the power distributor / combiner 42 to the power combiner 43 is referred to as a distortion removal circuit 40B. Call.

The linear signal transmission path 4AL and the main signal transmission path 4BM are delay lines which are simply cables, and the power distributor 41, power distributor / combiner 42, power combiner 43, etc. are, for example, directional couplers or hybrids. Composed of. For the linear signal transmission path 4AL of the distortion detection circuit 40A, the first variable attenuator 4A1 and the first variable phase shifter 4P1 are adjusted to cancel the main signal component at the output side of the power distributor 42 to the distortion injection path 4DL. , So that only the non-linear distortion component (difference component) due to the main amplifier 22-n remains, the loop of the distortion detection circuit 40A is balanced. Similarly,
The second variable attenuator 4A2 and the second variable phase shifter 4P2 are adjusted with respect to the signal of the main signal transmission path 4BM of the distortion removal circuit 40B to adjust the nonlinear distortion component of the main amplifier 22-n at the output side of the power combiner 43. By canceling and leaving only the main signal component, the loop of the distortion removing circuit 40B is balanced. Such a feedforward amplifier circuit itself for removing the non-linear distortion of the main amplifier 22-n is a well-known technique.

Next, the uniformity of the electrical characteristics of this feedforward multi-terminal power combining type power amplifier will be described. Each feedforward amplifier 24-n shown in FIG.
Is the delay line 4 in the distortion detection circuit 40A and the distortion removal circuit 40B.
It has 0D1 and 40D2. The distortion detection circuit 40A and the distortion removal circuit 40B include a power distributor / combiner 42 and a power combiner 4.
At 3 each route 4AM and 4AL and 4BM and 4D respectively
The signal from L is adjusted in amplitude and phase in one path so as to have equal amplitude, equal delay, and opposite phase, and the signals in the two paths are combined. At this time, the loop balance of the distortion detection circuit 40A and the distortion removal circuit 40B is determined by the adjustment accuracy of the amplitude and the phase.
Japanese Patent Application Publication No. As shown in No. 1-1198809 "Automatic gain adjustment circuit of feedforward amplifier", for example, in order to obtain a distortion suppression amount of 30 dB or more, the amplitude deviation and the phase deviation are within ± 0.3 dB and ± 2 deg, respectively. It is necessary to achieve loop balance of.

The delay line that constitutes the linear signal transmission path 4AL is a cable that connects the power distributor 41 and the power distributor / combiner 42, and the length of the delay line determines the delay amount. The variation in length can be made very small. Since the first variable phase shifter 4P1 may be adjusted with the delay line 4AL as a reference, this can also be determined with high accuracy. In the actual loop balance adjustment, the loop and balance adjustment can be performed with high accuracy by performing the phase and amplitude adjustment using the first pilot signal, as is commonly used in this type of technique, and as a result, Loop phase deviation within ± 2 deg, amplitude deviation within ±
It is relatively easy to set it within 0.3 dB.
Similarly, the loop balance adjustment of the distortion removal circuit 40B may be performed by adjusting the second variable phase shifter 4P2 together with the second variable attenuator 4A2 with reference to the main signal transmission path 4BM configured by the delay line. Use phase deviation ± 2de
High-precision loop balance adjustment within g and amplitude deviation within ± 0.3 dB can be performed.

As described above, as a method of realizing uniform electric characteristics of a plurality of main amplifiers in a multi-terminal power combining type power amplifier, it is effective to configure each main amplifier in a feedforward configuration. The feedforward multi-terminal power combining type power amplifier proposed in this publication is
It is shown that the present invention can be applied not only to the case of processing a plurality of communication systems as one wireless device but also to a transmission amplifier for a multi-beam and an adaptive array antenna.
However, the idea is to effectively use a plurality of amplifiers used in one wireless device.

[0013]

As described above, the sector-corresponding base station is provided with the radio device having the number of sectors. Therefore, the power consumption of the base station equipment and the size of the equipment are double the number of sectors. Future PDC system and IMT (Internatio)
It is necessary to house the equipment of the nal Mobile Telecommunications system in the same building or relay equipment, and it is required to have base station equipment with lower power consumption and smaller size and weight. It is an object of the present invention to provide a sector-compatible wireless base station device capable of achieving small size, light weight, and low power consumption based on the above background.

[0014]

A multi-terminal power combining amplifier having an input port and an output port corresponding to at least each sector is integrated with at least a transmission power amplifier of a radio device conventionally provided for each sector. And at least one of these transmission power amplifiers is used as a main amplifier between an input port and an output port corresponding to each sector, and a feedforward amplifier circuit for removing a distortion component generated from the main amplifier is configured. Connect the corresponding output port to the corresponding sector antenna. For example, in the case of 3 sectors, the number of input terminals of the feedforward multi-terminal power combining type power amplifier is at least 3.

[0015]

1 shows an embodiment of the present invention, in which parts corresponding to those in FIGS. 3 to 5 are designated by the same reference numerals. In this example, FDD (Frequency Division Duple)
This is a case where the present invention is applied to a device for a 3 sector base station for x). In this embodiment, three sectors SA1, SA2
At least a power amplification system in a wireless device for SA3 has a feedforward multi-terminal power combining power amplifier 1
Integrated as one wireless device. That is, the service area of this base station device is three sectors SA1, SA2, S.
The antenna is divided into A3, each of the sectors SA1, SA2, SA3 is provided with an antenna A1, A2, A3, respectively, and the antenna duplexers 11-1, 11- are provided for each of the antennas A1, A2, A3.
2, 11-3 are connected, and antenna duplexer 11-1, 1
Low noise amplifiers 15-1, 1 to 1-2 and 11-3, respectively.
5-2, 15-3 through each sector demodulation device 16-
1, 16-2, 16-3 are connected.

In this embodiment, the input ports IP1, IP2, IP3 connected to the output sides of the sector modulation devices 12-1, 12-2, 12-3, and the antenna A1,
The main amplifier 22- is provided between the transmission power supply terminals to A2 and A3, that is, the output ports OP1, OP2 and OP3 connected to the transmission input sides of the antenna duplexers 11-1, 11-2 and 11-3 in this example. A multi-terminal power combining type power amplifier 31 having 1, 22-2, 22-3 is connected, and further, between sector corresponding input ports IP1 and OP1, between IP2 and OP2, and I.
Main amplifiers 22-1, 22-2, 22 are provided between P3 and OP3.
-3 respectively, and feed-forward amplifier circuits 32-1 and 32- that remove the distortion component generated by the main amplifier.
2, 32-3 are configured respectively.

In FIG. 1B, since the diagram is complicated, only the part of the feedforward amplifier circuit 32-3 is shown, and the other feedforward amplifier circuits 32-1 and 32-2 are shown only partially. The three feedforward amplifier circuits 32-1, 32-2, 32-3 have the same configuration. Each feedforward amplifier circuit 32-1, 3
In 2-2 and 32-3, as shown by attaching the same reference numerals to the portions corresponding to those in FIG. 6, the modulation signals corresponding to the sectors SA1, SA2, and SA3 from the input port IP3 are transmitted by the power distributor 41 to the main amplifier. It is distributed to the path 4AM and the linear signal transmission path 4AL, respectively. The modulation signal distributed to each main amplifier path 4AM is the first variable phase shifter 4P1,
It is supplied to one corresponding input port of the multi-terminal power combiner 21 in the multi-terminal power combiner type power amplifier 31 through each of the first variable attenuators 4A1.

These modulated signals are transmitted to the main amplifiers 22-1 and 22-2.
2-2 and 22-3 are distributed and power-amplified, and these power-amplified outputs are combined by the multi-terminal power combiner 23 for each output modulation signal of each sector modulator 12-1, 12-2, 12-3. Power distribution / combiner 4 through each one port
2 respectively. The modulation signal distributed to each linear signal transmission path 4AL is supplied to the corresponding power distributor / combiner 42. The main amplifier path 4AM is a multi-terminal power combiner 2 in the multi-terminal power combiner type power amplifier 31.
One sector modulation signal from one input port of 1 is output to one output port of the multi-terminal power combiner 23 through the three main amplifiers 22-1, 22-2 and 22-3. Therefore, from its one input port to the main amplifier 22-
The paths that reach one output port through 1, 22-2 and 22-3 are the feedforward amplifier circuits 32-1 and
One main signal amplifier path 4 in 32-2, 32-3
A part of AM, that is, three main amplifiers 21-1 to 21-1
21-3 is the feedforward amplifier circuits 32-1 and 3
This means that a part of the main amplifier path 4AM of 2-2 and 32-3 is configured in common.

Each feedforward amplifier circuit 32-1
32-2 and 32-3, the power distributor / combiner 42 distributes and combines the sector modulation signals from the main amplifier path 4AM and the linear signal transfer path 4AL, and the main signal transfer path 4BM and the second variable It is supplied to each power combiner 43 through the phase injector 4P2, the second variable attenuator 4A2, and the distortion injection path 4DL including the auxiliary amplifier 4X. The feed-forward multi-terminal power combining type power amplifier 3 is constituted by the multi-terminal power combining type power amplifier 31 and the feed-forward amplifier circuits 32-1, 32-2, 32-3.
3 are configured.

With this configuration, the distortion component injected from the power distributor / combiner 42 into the distortion injection path 4DL is the main amplifier 2
2-1, 22-2, 22-3 respectively, and each sector modulation device 12-1, 12-2 in these distortion components,
The modulated signal of 12-3 is distributed power amplified, and is combined through the same path as the path combined with each one output port of the multi-terminal power combiner 23. Is removed from the power amplification output of the modulation signal for each sector SA1, SA2, SA3 by the distortion removal circuit 40B from the converter 42 to the power combiner 43, and the duplexer 11-
Sectors SA1, SA through 1, 11-2, 11-3
Power is supplied to antennas A1, A2 and A3 of S2 and SA3, respectively.

In order to support three sectors, the feedforward multi-terminal power combining type power amplifier 33 has at least three inputs and three outputs. The configuration of the multi-terminal power combiners 21 and 23 is, for example, a 3-terminal distributor having a Butler matrix configuration. When the feedforward multi-terminal power combining type power amplifier 33 with four inputs and four outputs is used, one of the four terminals is terminated by a terminator. As a result, the transmission signals of 3 sectors are power-amplified by the four main amplifiers 22-1 to 22-4. This configuration is a so-called redundant configuration. Even if one main amplifier fails, the power of the transmission signal can be amplified by commonly using the other main amplifier.

The power consumption of the feed-forward multi-terminal power combining type power amplifier 33 for the three sectors SA1, SA2, SA3 is the same as that of the conventional independent wireless device for the three sectors SA1, SA2.
Compared with the configuration used for SA2 and SA3, it is 1/3. Feedforward 4-terminal power combining type power amplifier 3
The power consumption when using 3 is 4 compared with the configuration using independent wireless devices for 3 sectors SA1, SA2, SA3.
/ 9. As described above, the use of the feedforward multi-terminal power combining type power amplifier 33 makes the configuration somewhat redundant, but achieves lower power consumption as compared with the conventional case where independent wireless devices are used for each sector.

FIG. 2 shows a feedforward multi-terminal power combining type power amplifier 33 and duplexers 11-1, 11-2, 11-.
3 and the low noise amplifiers 15-1, 15-2, 15-3 are provided as tower top devices 34 in towers (not shown) for the antennas A1, A2, A3. A feedforward multi-terminal power combining type power amplifier 33 of the tower top device 34,
The low-noise amplifiers 15-1 to 15-3 are modulators 12-1 to 12-3 and demodulators 16-1 to 16-3 housed in relay equipment.
16-3 and coaxial cable or optical fiber cable 35
-1 to 35-3 and 36-1 to 36-3 are connected. These cables 35-1 to 35-3 and 36-1 to 3
6-3 are the references (Yasuyoshi Suzuki, Chen Qiang, Yoshiaki Tarusawa,
Tetsuo Hirota, Toshio Nojima, 2 GHz band overhead type adaptive array RF circuit, IEICE Radio Communication System Research Group, RCS2001-81, July 2001). The base station device configuration shown in FIG. 2 enables lower power consumption than the conventional configuration shown in FIG. 3, and enables installation of a front end tower.

Incidentally, for example, TDM such as PDC
In the case of the A system, the operating frequency and the number of channels are different for each sector. Power leakage to other sectors is power leakage to other channels. The permissible value of this power leakage needs to be equal to or less than the standard value regarding the power leakage to other channels. In the case of PDC, the transmission spurious must be -60 dB or less or 2.5 μW with respect to the transmission output (literature, digital car telephone system standard RCR STD-27). However, the amount of distortion suppression by the feedforward configuration is disclosed in Japanese Patent Application No. 63-23574.
It is shown in "Automatic Adjustment Circuit of Feedforward Amplifier". For example, it is necessary to achieve loop balance within ± 2 deg and ± 0.3 dB in the amplitude deviation and phase deviation for obtaining the distortion suppression amount of 30 dB or more, respectively. On the other hand, the gain standard deviation and phase amount standard deviation of the multi-terminal power combining type power amplifier that achieves isolation between terminals of 30 dB are 0.7 dB and 5 deg, respectively, and the amplitude deviation and phase of the distortion suppression amount of 30 dB or less due to the feedforward configuration. Less deviation can be realized.

For this reason, the feedforward multi-terminal power combining type power amplifier 33 can achieve more isolation than the conventional multi-port power amplifier (multi-terminal power combining type power amplifier). If the isolation of the multi-port power amplifier 31 of the main amplifier portion is 30 dB and the distortion component suppression amount of the distortion removal circuit 40B is 30 dB, the isolation of 60 dB can be achieved as a whole. This satisfies the above-mentioned PDC transmission spurious standard. Also in this invention, as described in the above publication, by various methods using pilot signals,
Each loop of the distortion detection circuit 40A and the distortion removal circuit 40B can be held in a balanced state with high accuracy.

1 and 2 show an FDD system base station apparatus, the present invention is applicable not only to the FDD system but also to the TDD system.
The same effect can be obtained by applying the same to the (Time Division Duplex) method. In the TDD system, the antenna duplexers 11-1 and 11- in the FDD system base station device are used.
It is only necessary to replace 2, 11-3 with an RF switch and change the configuration to switch between the transmitting side and the receiving side. 3 in the above
Although the present invention is applied to the sector base station device, it can also be applied to a 6-sector base station device and other multi-sector base station devices.

[0027]

As described above, according to the present invention, the wireless devices of the base stations of a plurality of sectors are integrated to reduce the power consumption of the sector base station equipment and the size and weight of the transmission power amplifier. You can

[Brief description of drawings]

FIG. 1A is a diagram showing an arrangement example of a sector and an antenna, and B is a functional configuration diagram showing an embodiment of the present invention.

FIG. 2 is a functional configuration diagram showing another embodiment of the present invention.

FIG. 3A is a diagram showing an arrangement example of sectors and antennas, and FIG. 3B is a diagram showing a configuration of a conventional sector base station apparatus.

FIG. 4 is a diagram showing a conventional multi-terminal power combining type power amplifier.

FIG. 5 is a diagram showing a conventional feedforward multi-terminal power combining type power amplifier.

FIG. 6 is a diagram showing a specific example of a conventional feedforward multi-terminal power combining type power amplifier.

Claims (5)

[Claims] 1. A radio base station apparatus comprising a plurality of service sectors each having an antenna and amplifying the power of a modulated output signal from the modulation apparatus corresponding to each sector and feeding the power to the corresponding antenna. A plurality of input ports to which modulated signals are respectively supplied, a plurality of output ports for feeding the power amplification output to the antenna of the corresponding sector, and a multi-terminal power combining type power amplifier having a plurality of main amplifiers; And a feedforward amplifier circuit configured to include the plurality of main amplifiers between an input port and an output port and removing distortion components generated by the main amplifiers. A feedforward multi-terminal power combining type power amplifier is configured by The apparatus for the radio base station, characterized in that are. 2. A radio base station apparatus comprising a plurality of service sectors, each of which has an antenna, and each of which modulates a power of a modulation output signal from the modulation apparatus corresponding to each sector and supplies the amplified power to the corresponding antenna. The input side multi-terminal power combiner connected to the plurality of input ports to which the modulated signals are respectively supplied, and the plurality of feed forward amplifier circuits connected to the output terminals of the input side multi-terminal power combiner, Each power amplification output from these feed-forward amplification circuits is input, and an output-side multi-terminal power combiner connected to a plurality of output ports whose output terminals feed the antenna of the corresponding sector is provided. Feed-forward multi-terminal power by the terminal power combiner, the plurality of feed-forward amplifier circuits, and the output-side multi-terminal power combiner The molding power amplifier is configured device for a radio base station according to claim. 3. A plurality of antenna duplexers that are inserted between each antenna and an output port to separate a reception signal from the antenna from a transmission signal to the antenna and output the same, and a separation from these antenna duplexers. The radio base station apparatus according to claim 1 or 2, further comprising a plurality of reception amplifiers that respectively amplify the received signals. 4. A plurality of transmission / reception units connected to the respective antennas, and a plurality of switching amplifiers connected to the respective antennas to switch between an output port of the corresponding sector and an input side of the reception amplifier of the corresponding sector. The radio base station apparatus according to claim 1 or 2, further comprising a changeover switch. 5. The radio base station apparatus according to claim 1, wherein the feedforward multi-terminal power combining type power amplifier is installed in a tower provided with the antenna. .